CS4923 datasheet(31/56 Pages) CIRRUS

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CS4923/4/5/6/7/8/9

DS262F2

POWER

The CS492X requires a 3.3V digital power supply

for the digital logic within the DSP and a 3.3V

analog power supply for the internal PLL. There

are three digital power pins, VD1, VD2 and VD3,

along with three digital grounds, DGND1, DGND2

and DGND3. There is one analog power pin, VA

and one analog ground, AGND. The DSP will

perform at its best when noise has been eliminated

from the power supply. The recommendations

given

below

for

decoupling

and

power

conditioning of the CS492X will help to ensure

reliable performance.

4.1 Decoupling

It is good practice to decouple noise from the

power supply by placing capacitors directly

between the power and ground of the CS492X.

Each

pair

power

pins

(VD1/DGND,

VD2/DGND, VD3/DGND, VA/AGND) should

have

its

own

decoupling

capacitors.

The

recommended procedure is to place both a 0.1uF

and a 1uF capacitor as close as physically possible

to each power pin. The 0.1uF capacitor should be

closest to the device (typically 5mm or closer).

4.2 Analog Power Conditioning

In order to obtain the best performance from the

CS4923/4/5/6/7/8/9’s internal PLL, the analog

power supply (VA) must be as clean as possible. A

ferrite bead should be used to filter the 3.3V power

supply for the analog portion of the CS492X. This

power scheme is shown in the typical connection

diagrams.

4.3 Pads

Revision

and

all

subsequent

revisions

incorporate 5V tolerant pads. This means that while

the CS492X power supplies require 3.3 volts, 5 volt

signals can be applied to the inputs without

damaging the part.

The I/O pads for Revision B of the CS4923/4/5/6

are not 5 volt tolerant. Input levels for revision B of

the CS4923/4/5/6 should be no greater than 3.3

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